Jason Rothenberg told viewers the first four episodes would take viewers to the top of The 100 rollercoaster, and from the description of "Bitter Harvest," it sounds like the stomach-dropping descent will throw in a few loop-de-loops all the way through episode 6.

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The purportedly bloody events of "Hakeldama" will lead into the Feb. 25 episode, and Clarke will be harboring thoughts of revenge once more.

"A quiet and mysterious threat is brewing," The CW teased. "Clarke (Eliza Taylor) is torn between vengeance and mercy. Meanwhile, Kane (Henry Ian Cusick) and Octavia (Marie Avgeropoulos) work together to avert a disaster, and Abby (Paige Turco) continues to worry about Raven (Lindsey Morgan)."

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The explosion of Mount Weather can't have helped Raven's condition, but despite any injuries, the mechanic's brain will still be going full throttle.

"She's going to be disabled forever and part of her journey is realizing that she's still not just useful but heroic and crucial to the survival of the whole group," Rothenberg told E! Online. Raven is "everything. Without her brain, they'd have been dead multiple times. She becomes a key factor in the survival of the human race this season."

Find out what's next for the Grounders and the Arkers when The 100 airs Thursdays at 9 p.m. ET.

Tags: The 100 television the cw